diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index b7f6853f74..7adfecb222 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -1547,7 +1547,9 @@ SDOperand DAGCombiner::visitSIGN_EXTEND(SDNode *N) { if (N0.getOpcode() == ISD::SEXTLOAD && VT == N0.getValueType()) return N0; // fold (sext (truncate x)) -> (sextinreg x) iff x size == sext size. - if (N0.getOpcode() == ISD::TRUNCATE && N0.getOperand(0).getValueType() == VT) + if (N0.getOpcode() == ISD::TRUNCATE && N0.getOperand(0).getValueType() == VT&& + (!AfterLegalize || + TLI.isOperationLegal(ISD::SIGN_EXTEND_INREG, N0.getValueType()))) return DAG.getNode(ISD::SIGN_EXTEND_INREG, VT, N0.getOperand(0), DAG.getValueType(N0.getValueType())); // fold (sext (load x)) -> (sextload x) |